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Commit | Line | Data |
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c0c77d8f BT |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* XDP sockets | |
3 | * | |
4 | * AF_XDP sockets allows a channel between XDP programs and userspace | |
5 | * applications. | |
6 | * Copyright(c) 2018 Intel Corporation. | |
7 | * | |
c0c77d8f BT |
8 | * Author(s): Björn Töpel <bjorn.topel@intel.com> |
9 | * Magnus Karlsson <magnus.karlsson@intel.com> | |
10 | */ | |
11 | ||
12 | #define pr_fmt(fmt) "AF_XDP: %s: " fmt, __func__ | |
13 | ||
14 | #include <linux/if_xdp.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/sched/mm.h> | |
17 | #include <linux/sched/signal.h> | |
18 | #include <linux/sched/task.h> | |
19 | #include <linux/socket.h> | |
20 | #include <linux/file.h> | |
21 | #include <linux/uaccess.h> | |
22 | #include <linux/net.h> | |
23 | #include <linux/netdevice.h> | |
ac98d8aa | 24 | #include <linux/rculist.h> |
a71506a4 | 25 | #include <net/xdp_sock_drv.h> |
a0731952 | 26 | #include <net/busy_poll.h> |
b9b6b68e | 27 | #include <net/xdp.h> |
c0c77d8f | 28 | |
423f3832 | 29 | #include "xsk_queue.h" |
c0c77d8f | 30 | #include "xdp_umem.h" |
a36b38aa | 31 | #include "xsk.h" |
c0c77d8f | 32 | |
e7a1c130 | 33 | #define TX_BATCH_SIZE 32 |
35fcde7f | 34 | |
e312b9e7 BT |
35 | static DEFINE_PER_CPU(struct list_head, xskmap_flush_list); |
36 | ||
c4655761 | 37 | void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b | 38 | { |
c2d3d6a4 | 39 | if (pool->cached_need_wakeup & XDP_WAKEUP_RX) |
77cd0d7b MK |
40 | return; |
41 | ||
7361f9c3 | 42 | pool->fq->ring->flags |= XDP_RING_NEED_WAKEUP; |
c2d3d6a4 | 43 | pool->cached_need_wakeup |= XDP_WAKEUP_RX; |
77cd0d7b MK |
44 | } |
45 | EXPORT_SYMBOL(xsk_set_rx_need_wakeup); | |
46 | ||
c4655761 | 47 | void xsk_set_tx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b MK |
48 | { |
49 | struct xdp_sock *xs; | |
50 | ||
c2d3d6a4 | 51 | if (pool->cached_need_wakeup & XDP_WAKEUP_TX) |
77cd0d7b MK |
52 | return; |
53 | ||
54 | rcu_read_lock(); | |
a5aa8e52 | 55 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
77cd0d7b MK |
56 | xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP; |
57 | } | |
58 | rcu_read_unlock(); | |
59 | ||
c2d3d6a4 | 60 | pool->cached_need_wakeup |= XDP_WAKEUP_TX; |
77cd0d7b MK |
61 | } |
62 | EXPORT_SYMBOL(xsk_set_tx_need_wakeup); | |
63 | ||
c4655761 | 64 | void xsk_clear_rx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b | 65 | { |
c2d3d6a4 | 66 | if (!(pool->cached_need_wakeup & XDP_WAKEUP_RX)) |
77cd0d7b MK |
67 | return; |
68 | ||
7361f9c3 | 69 | pool->fq->ring->flags &= ~XDP_RING_NEED_WAKEUP; |
c2d3d6a4 | 70 | pool->cached_need_wakeup &= ~XDP_WAKEUP_RX; |
77cd0d7b MK |
71 | } |
72 | EXPORT_SYMBOL(xsk_clear_rx_need_wakeup); | |
73 | ||
c4655761 | 74 | void xsk_clear_tx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b MK |
75 | { |
76 | struct xdp_sock *xs; | |
77 | ||
c2d3d6a4 | 78 | if (!(pool->cached_need_wakeup & XDP_WAKEUP_TX)) |
77cd0d7b MK |
79 | return; |
80 | ||
81 | rcu_read_lock(); | |
a5aa8e52 | 82 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
77cd0d7b MK |
83 | xs->tx->ring->flags &= ~XDP_RING_NEED_WAKEUP; |
84 | } | |
85 | rcu_read_unlock(); | |
86 | ||
c2d3d6a4 | 87 | pool->cached_need_wakeup &= ~XDP_WAKEUP_TX; |
77cd0d7b MK |
88 | } |
89 | EXPORT_SYMBOL(xsk_clear_tx_need_wakeup); | |
90 | ||
c4655761 | 91 | bool xsk_uses_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b | 92 | { |
c2d3d6a4 | 93 | return pool->uses_need_wakeup; |
77cd0d7b | 94 | } |
c4655761 | 95 | EXPORT_SYMBOL(xsk_uses_need_wakeup); |
77cd0d7b | 96 | |
1c1efc2a MK |
97 | struct xsk_buff_pool *xsk_get_pool_from_qid(struct net_device *dev, |
98 | u16 queue_id) | |
99 | { | |
100 | if (queue_id < dev->real_num_rx_queues) | |
101 | return dev->_rx[queue_id].pool; | |
102 | if (queue_id < dev->real_num_tx_queues) | |
103 | return dev->_tx[queue_id].pool; | |
104 | ||
105 | return NULL; | |
106 | } | |
107 | EXPORT_SYMBOL(xsk_get_pool_from_qid); | |
108 | ||
109 | void xsk_clear_pool_at_qid(struct net_device *dev, u16 queue_id) | |
110 | { | |
b425e24a | 111 | if (queue_id < dev->num_rx_queues) |
1c1efc2a | 112 | dev->_rx[queue_id].pool = NULL; |
b425e24a | 113 | if (queue_id < dev->num_tx_queues) |
1c1efc2a MK |
114 | dev->_tx[queue_id].pool = NULL; |
115 | } | |
116 | ||
117 | /* The buffer pool is stored both in the _rx struct and the _tx struct as we do | |
118 | * not know if the device has more tx queues than rx, or the opposite. | |
119 | * This might also change during run time. | |
120 | */ | |
121 | int xsk_reg_pool_at_qid(struct net_device *dev, struct xsk_buff_pool *pool, | |
122 | u16 queue_id) | |
123 | { | |
124 | if (queue_id >= max_t(unsigned int, | |
125 | dev->real_num_rx_queues, | |
126 | dev->real_num_tx_queues)) | |
127 | return -EINVAL; | |
128 | ||
129 | if (queue_id < dev->real_num_rx_queues) | |
130 | dev->_rx[queue_id].pool = pool; | |
131 | if (queue_id < dev->real_num_tx_queues) | |
132 | dev->_tx[queue_id].pool = pool; | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
26062b18 BT |
137 | void xp_release(struct xdp_buff_xsk *xskb) |
138 | { | |
139 | xskb->pool->free_heads[xskb->pool->free_heads_cnt++] = xskb; | |
140 | } | |
141 | ||
142 | static u64 xp_get_handle(struct xdp_buff_xsk *xskb) | |
143 | { | |
144 | u64 offset = xskb->xdp.data - xskb->xdp.data_hard_start; | |
145 | ||
146 | offset += xskb->pool->headroom; | |
147 | if (!xskb->pool->unaligned) | |
148 | return xskb->orig_addr + offset; | |
149 | return xskb->orig_addr + (offset << XSK_UNALIGNED_BUF_OFFSET_SHIFT); | |
150 | } | |
151 | ||
2b43470a | 152 | static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) |
c05cd364 | 153 | { |
2b43470a BT |
154 | struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp); |
155 | u64 addr; | |
156 | int err; | |
c05cd364 | 157 | |
2b43470a BT |
158 | addr = xp_get_handle(xskb); |
159 | err = xskq_prod_reserve_desc(xs->rx, addr, len); | |
160 | if (err) { | |
8aa5a335 | 161 | xs->rx_queue_full++; |
2b43470a | 162 | return err; |
c05cd364 KL |
163 | } |
164 | ||
2b43470a BT |
165 | xp_release(xskb); |
166 | return 0; | |
c05cd364 KL |
167 | } |
168 | ||
2b43470a | 169 | static void xsk_copy_xdp(struct xdp_buff *to, struct xdp_buff *from, u32 len) |
c497176c | 170 | { |
2b43470a | 171 | void *from_buf, *to_buf; |
18baed26 | 172 | u32 metalen; |
c497176c | 173 | |
2b43470a BT |
174 | if (unlikely(xdp_data_meta_unsupported(from))) { |
175 | from_buf = from->data; | |
176 | to_buf = to->data; | |
18baed26 BT |
177 | metalen = 0; |
178 | } else { | |
2b43470a BT |
179 | from_buf = from->data_meta; |
180 | metalen = from->data - from->data_meta; | |
181 | to_buf = to->data - metalen; | |
18baed26 BT |
182 | } |
183 | ||
2b43470a | 184 | memcpy(to_buf, from_buf, len + metalen); |
c497176c BT |
185 | } |
186 | ||
458f7272 | 187 | static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) |
c497176c | 188 | { |
2b43470a BT |
189 | struct xdp_buff *xsk_xdp; |
190 | int err; | |
458f7272 | 191 | u32 len; |
c497176c | 192 | |
458f7272 | 193 | len = xdp->data_end - xdp->data; |
c4655761 | 194 | if (len > xsk_pool_get_rx_frame_size(xs->pool)) { |
2b43470a BT |
195 | xs->rx_dropped++; |
196 | return -ENOSPC; | |
197 | } | |
198 | ||
c4655761 | 199 | xsk_xdp = xsk_buff_alloc(xs->pool); |
2b43470a | 200 | if (!xsk_xdp) { |
173d3adb | 201 | xs->rx_dropped++; |
2b43470a BT |
202 | return -ENOSPC; |
203 | } | |
c497176c | 204 | |
2b43470a BT |
205 | xsk_copy_xdp(xsk_xdp, xdp, len); |
206 | err = __xsk_rcv_zc(xs, xsk_xdp, len); | |
207 | if (err) { | |
208 | xsk_buff_free(xsk_xdp); | |
209 | return err; | |
210 | } | |
2b43470a | 211 | return 0; |
c497176c BT |
212 | } |
213 | ||
3413f041 XZ |
214 | static bool xsk_tx_writeable(struct xdp_sock *xs) |
215 | { | |
216 | if (xskq_cons_present_entries(xs->tx) > xs->tx->nentries / 2) | |
217 | return false; | |
218 | ||
219 | return true; | |
220 | } | |
221 | ||
42fddcc7 BT |
222 | static bool xsk_is_bound(struct xdp_sock *xs) |
223 | { | |
224 | if (READ_ONCE(xs->state) == XSK_BOUND) { | |
225 | /* Matches smp_wmb() in bind(). */ | |
226 | smp_rmb(); | |
227 | return true; | |
228 | } | |
229 | return false; | |
230 | } | |
231 | ||
458f7272 | 232 | static int xsk_rcv_check(struct xdp_sock *xs, struct xdp_buff *xdp) |
173d3adb | 233 | { |
42fddcc7 BT |
234 | if (!xsk_is_bound(xs)) |
235 | return -EINVAL; | |
236 | ||
173d3adb BT |
237 | if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) |
238 | return -EINVAL; | |
239 | ||
b02e5a0e | 240 | sk_mark_napi_id_once_xdp(&xs->sk, xdp); |
458f7272 | 241 | return 0; |
173d3adb BT |
242 | } |
243 | ||
d817991c | 244 | static void xsk_flush(struct xdp_sock *xs) |
c497176c | 245 | { |
59e35e55 | 246 | xskq_prod_submit(xs->rx); |
7361f9c3 | 247 | __xskq_cons_release(xs->pool->fq); |
43a825af | 248 | sock_def_readable(&xs->sk); |
c497176c BT |
249 | } |
250 | ||
251 | int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) | |
252 | { | |
253 | int err; | |
254 | ||
bf0bdd13 | 255 | spin_lock_bh(&xs->rx_lock); |
458f7272 BT |
256 | err = xsk_rcv_check(xs, xdp); |
257 | if (!err) { | |
258 | err = __xsk_rcv(xs, xdp); | |
259 | xsk_flush(xs); | |
260 | } | |
bf0bdd13 | 261 | spin_unlock_bh(&xs->rx_lock); |
c497176c BT |
262 | return err; |
263 | } | |
264 | ||
458f7272 BT |
265 | static int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) |
266 | { | |
267 | int err; | |
268 | u32 len; | |
269 | ||
270 | err = xsk_rcv_check(xs, xdp); | |
271 | if (err) | |
272 | return err; | |
273 | ||
274 | if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL) { | |
275 | len = xdp->data_end - xdp->data; | |
276 | return __xsk_rcv_zc(xs, xdp, len); | |
277 | } | |
278 | ||
279 | err = __xsk_rcv(xs, xdp); | |
280 | if (!err) | |
281 | xdp_return_buff(xdp); | |
282 | return err; | |
283 | } | |
284 | ||
e312b9e7 | 285 | int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp) |
d817991c | 286 | { |
e312b9e7 | 287 | struct list_head *flush_list = this_cpu_ptr(&xskmap_flush_list); |
d817991c BT |
288 | int err; |
289 | ||
458f7272 | 290 | err = xsk_rcv(xs, xdp); |
d817991c BT |
291 | if (err) |
292 | return err; | |
293 | ||
294 | if (!xs->flush_node.prev) | |
295 | list_add(&xs->flush_node, flush_list); | |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
e312b9e7 | 300 | void __xsk_map_flush(void) |
d817991c | 301 | { |
e312b9e7 | 302 | struct list_head *flush_list = this_cpu_ptr(&xskmap_flush_list); |
d817991c BT |
303 | struct xdp_sock *xs, *tmp; |
304 | ||
305 | list_for_each_entry_safe(xs, tmp, flush_list, flush_node) { | |
306 | xsk_flush(xs); | |
307 | __list_del_clearprev(&xs->flush_node); | |
308 | } | |
309 | } | |
310 | ||
c4655761 | 311 | void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries) |
ac98d8aa | 312 | { |
7361f9c3 | 313 | xskq_prod_submit_n(pool->cq, nb_entries); |
ac98d8aa | 314 | } |
c4655761 | 315 | EXPORT_SYMBOL(xsk_tx_completed); |
ac98d8aa | 316 | |
c4655761 | 317 | void xsk_tx_release(struct xsk_buff_pool *pool) |
ac98d8aa MK |
318 | { |
319 | struct xdp_sock *xs; | |
320 | ||
321 | rcu_read_lock(); | |
a5aa8e52 | 322 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
30744a68 | 323 | __xskq_cons_release(xs->tx); |
3413f041 XZ |
324 | if (xsk_tx_writeable(xs)) |
325 | xs->sk.sk_write_space(&xs->sk); | |
ac98d8aa MK |
326 | } |
327 | rcu_read_unlock(); | |
328 | } | |
c4655761 | 329 | EXPORT_SYMBOL(xsk_tx_release); |
ac98d8aa | 330 | |
c4655761 | 331 | bool xsk_tx_peek_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc) |
ac98d8aa | 332 | { |
ac98d8aa MK |
333 | struct xdp_sock *xs; |
334 | ||
335 | rcu_read_lock(); | |
a5aa8e52 | 336 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
1c1efc2a | 337 | if (!xskq_cons_peek_desc(xs->tx, desc, pool)) { |
8aa5a335 | 338 | xs->tx->queue_empty_descs++; |
ac98d8aa | 339 | continue; |
8aa5a335 | 340 | } |
ac98d8aa | 341 | |
0a05861f | 342 | /* This is the backpressure mechanism for the Tx path. |
15d8c916 MK |
343 | * Reserve space in the completion queue and only proceed |
344 | * if there is space in it. This avoids having to implement | |
345 | * any buffering in the Tx path. | |
346 | */ | |
7361f9c3 | 347 | if (xskq_prod_reserve_addr(pool->cq, desc->addr)) |
ac98d8aa MK |
348 | goto out; |
349 | ||
c5ed924b | 350 | xskq_cons_release(xs->tx); |
ac98d8aa MK |
351 | rcu_read_unlock(); |
352 | return true; | |
353 | } | |
354 | ||
355 | out: | |
356 | rcu_read_unlock(); | |
357 | return false; | |
358 | } | |
c4655761 | 359 | EXPORT_SYMBOL(xsk_tx_peek_desc); |
ac98d8aa | 360 | |
9349eb3a MK |
361 | static u32 xsk_tx_peek_release_fallback(struct xsk_buff_pool *pool, struct xdp_desc *descs, |
362 | u32 max_entries) | |
363 | { | |
364 | u32 nb_pkts = 0; | |
365 | ||
366 | while (nb_pkts < max_entries && xsk_tx_peek_desc(pool, &descs[nb_pkts])) | |
367 | nb_pkts++; | |
368 | ||
369 | xsk_tx_release(pool); | |
370 | return nb_pkts; | |
371 | } | |
372 | ||
373 | u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, struct xdp_desc *descs, | |
374 | u32 max_entries) | |
375 | { | |
376 | struct xdp_sock *xs; | |
377 | u32 nb_pkts; | |
378 | ||
379 | rcu_read_lock(); | |
380 | if (!list_is_singular(&pool->xsk_tx_list)) { | |
381 | /* Fallback to the non-batched version */ | |
382 | rcu_read_unlock(); | |
383 | return xsk_tx_peek_release_fallback(pool, descs, max_entries); | |
384 | } | |
385 | ||
386 | xs = list_first_or_null_rcu(&pool->xsk_tx_list, struct xdp_sock, tx_list); | |
387 | if (!xs) { | |
388 | nb_pkts = 0; | |
389 | goto out; | |
390 | } | |
391 | ||
392 | nb_pkts = xskq_cons_peek_desc_batch(xs->tx, descs, pool, max_entries); | |
393 | if (!nb_pkts) { | |
394 | xs->tx->queue_empty_descs++; | |
395 | goto out; | |
396 | } | |
397 | ||
398 | /* This is the backpressure mechanism for the Tx path. Try to | |
399 | * reserve space in the completion queue for all packets, but | |
400 | * if there are fewer slots available, just process that many | |
401 | * packets. This avoids having to implement any buffering in | |
402 | * the Tx path. | |
403 | */ | |
404 | nb_pkts = xskq_prod_reserve_addr_batch(pool->cq, descs, nb_pkts); | |
405 | if (!nb_pkts) | |
406 | goto out; | |
407 | ||
408 | xskq_cons_release_n(xs->tx, nb_pkts); | |
409 | __xskq_cons_release(xs->tx); | |
410 | xs->sk.sk_write_space(&xs->sk); | |
411 | ||
412 | out: | |
413 | rcu_read_unlock(); | |
414 | return nb_pkts; | |
415 | } | |
416 | EXPORT_SYMBOL(xsk_tx_peek_release_desc_batch); | |
417 | ||
06870682 | 418 | static int xsk_wakeup(struct xdp_sock *xs, u8 flags) |
ac98d8aa | 419 | { |
ac98d8aa | 420 | struct net_device *dev = xs->dev; |
06870682 MM |
421 | int err; |
422 | ||
423 | rcu_read_lock(); | |
424 | err = dev->netdev_ops->ndo_xsk_wakeup(dev, xs->queue_id, flags); | |
425 | rcu_read_unlock(); | |
ac98d8aa | 426 | |
06870682 MM |
427 | return err; |
428 | } | |
429 | ||
430 | static int xsk_zc_xmit(struct xdp_sock *xs) | |
431 | { | |
432 | return xsk_wakeup(xs, XDP_WAKEUP_TX); | |
ac98d8aa MK |
433 | } |
434 | ||
35fcde7f MK |
435 | static void xsk_destruct_skb(struct sk_buff *skb) |
436 | { | |
bbff2f32 | 437 | u64 addr = (u64)(long)skb_shinfo(skb)->destructor_arg; |
35fcde7f | 438 | struct xdp_sock *xs = xdp_sk(skb->sk); |
a9744f7c | 439 | unsigned long flags; |
35fcde7f | 440 | |
f09ced40 | 441 | spin_lock_irqsave(&xs->pool->cq_lock, flags); |
7361f9c3 | 442 | xskq_prod_submit_addr(xs->pool->cq, addr); |
f09ced40 | 443 | spin_unlock_irqrestore(&xs->pool->cq_lock, flags); |
35fcde7f MK |
444 | |
445 | sock_wfree(skb); | |
446 | } | |
447 | ||
9c8f21e6 XZ |
448 | static struct sk_buff *xsk_build_skb_zerocopy(struct xdp_sock *xs, |
449 | struct xdp_desc *desc) | |
450 | { | |
451 | struct xsk_buff_pool *pool = xs->pool; | |
452 | u32 hr, len, ts, offset, copy, copied; | |
453 | struct sk_buff *skb; | |
454 | struct page *page; | |
455 | void *buffer; | |
456 | int err, i; | |
457 | u64 addr; | |
458 | ||
459 | hr = max(NET_SKB_PAD, L1_CACHE_ALIGN(xs->dev->needed_headroom)); | |
460 | ||
461 | skb = sock_alloc_send_skb(&xs->sk, hr, 1, &err); | |
462 | if (unlikely(!skb)) | |
463 | return ERR_PTR(err); | |
464 | ||
465 | skb_reserve(skb, hr); | |
466 | ||
467 | addr = desc->addr; | |
468 | len = desc->len; | |
469 | ts = pool->unaligned ? len : pool->chunk_size; | |
470 | ||
471 | buffer = xsk_buff_raw_get_data(pool, addr); | |
472 | offset = offset_in_page(buffer); | |
473 | addr = buffer - pool->addrs; | |
474 | ||
475 | for (copied = 0, i = 0; copied < len; i++) { | |
476 | page = pool->umem->pgs[addr >> PAGE_SHIFT]; | |
477 | get_page(page); | |
478 | ||
479 | copy = min_t(u32, PAGE_SIZE - offset, len - copied); | |
480 | skb_fill_page_desc(skb, i, page, offset, copy); | |
481 | ||
482 | copied += copy; | |
483 | addr += copy; | |
484 | offset = 0; | |
485 | } | |
486 | ||
487 | skb->len += len; | |
488 | skb->data_len += len; | |
489 | skb->truesize += ts; | |
490 | ||
491 | refcount_add(ts, &xs->sk.sk_wmem_alloc); | |
492 | ||
493 | return skb; | |
494 | } | |
495 | ||
496 | static struct sk_buff *xsk_build_skb(struct xdp_sock *xs, | |
497 | struct xdp_desc *desc) | |
498 | { | |
499 | struct net_device *dev = xs->dev; | |
500 | struct sk_buff *skb; | |
501 | ||
502 | if (dev->priv_flags & IFF_TX_SKB_NO_LINEAR) { | |
503 | skb = xsk_build_skb_zerocopy(xs, desc); | |
504 | if (IS_ERR(skb)) | |
505 | return skb; | |
506 | } else { | |
507 | u32 hr, tr, len; | |
508 | void *buffer; | |
509 | int err; | |
510 | ||
511 | hr = max(NET_SKB_PAD, L1_CACHE_ALIGN(dev->needed_headroom)); | |
512 | tr = dev->needed_tailroom; | |
513 | len = desc->len; | |
514 | ||
515 | skb = sock_alloc_send_skb(&xs->sk, hr + len + tr, 1, &err); | |
516 | if (unlikely(!skb)) | |
517 | return ERR_PTR(err); | |
518 | ||
519 | skb_reserve(skb, hr); | |
520 | skb_put(skb, len); | |
521 | ||
522 | buffer = xsk_buff_raw_get_data(xs->pool, desc->addr); | |
523 | err = skb_store_bits(skb, 0, buffer, len); | |
524 | if (unlikely(err)) { | |
525 | kfree_skb(skb); | |
526 | return ERR_PTR(err); | |
527 | } | |
528 | } | |
529 | ||
530 | skb->dev = dev; | |
531 | skb->priority = xs->sk.sk_priority; | |
532 | skb->mark = xs->sk.sk_mark; | |
533 | skb_shinfo(skb)->destructor_arg = (void *)(long)desc->addr; | |
534 | skb->destructor = xsk_destruct_skb; | |
535 | ||
536 | return skb; | |
537 | } | |
538 | ||
df551058 | 539 | static int xsk_generic_xmit(struct sock *sk) |
35fcde7f | 540 | { |
35fcde7f | 541 | struct xdp_sock *xs = xdp_sk(sk); |
df551058 | 542 | u32 max_batch = TX_BATCH_SIZE; |
35fcde7f MK |
543 | bool sent_frame = false; |
544 | struct xdp_desc desc; | |
545 | struct sk_buff *skb; | |
f09ced40 | 546 | unsigned long flags; |
35fcde7f MK |
547 | int err = 0; |
548 | ||
35fcde7f MK |
549 | mutex_lock(&xs->mutex); |
550 | ||
67571640 IM |
551 | if (xs->queue_id >= xs->dev->real_num_tx_queues) |
552 | goto out; | |
553 | ||
1c1efc2a | 554 | while (xskq_cons_peek_desc(xs->tx, &desc, xs->pool)) { |
35fcde7f MK |
555 | if (max_batch-- == 0) { |
556 | err = -EAGAIN; | |
557 | goto out; | |
558 | } | |
559 | ||
9c8f21e6 XZ |
560 | skb = xsk_build_skb(xs, &desc); |
561 | if (IS_ERR(skb)) { | |
562 | err = PTR_ERR(skb); | |
35fcde7f | 563 | goto out; |
9c8f21e6 | 564 | } |
35fcde7f | 565 | |
0a05861f | 566 | /* This is the backpressure mechanism for the Tx path. |
15d8c916 MK |
567 | * Reserve space in the completion queue and only proceed |
568 | * if there is space in it. This avoids having to implement | |
569 | * any buffering in the Tx path. | |
570 | */ | |
f09ced40 | 571 | spin_lock_irqsave(&xs->pool->cq_lock, flags); |
9c8f21e6 | 572 | if (xskq_prod_reserve(xs->pool->cq)) { |
f09ced40 | 573 | spin_unlock_irqrestore(&xs->pool->cq_lock, flags); |
35fcde7f MK |
574 | kfree_skb(skb); |
575 | goto out; | |
576 | } | |
f09ced40 | 577 | spin_unlock_irqrestore(&xs->pool->cq_lock, flags); |
35fcde7f | 578 | |
36ccdf85 | 579 | err = __dev_direct_xmit(skb, xs->queue_id); |
642e450b MK |
580 | if (err == NETDEV_TX_BUSY) { |
581 | /* Tell user-space to retry the send */ | |
582 | skb->destructor = sock_wfree; | |
b1b95cb5 MK |
583 | spin_lock_irqsave(&xs->pool->cq_lock, flags); |
584 | xskq_prod_cancel(xs->pool->cq); | |
585 | spin_unlock_irqrestore(&xs->pool->cq_lock, flags); | |
642e450b MK |
586 | /* Free skb without triggering the perf drop trace */ |
587 | consume_skb(skb); | |
588 | err = -EAGAIN; | |
589 | goto out; | |
590 | } | |
591 | ||
c5ed924b | 592 | xskq_cons_release(xs->tx); |
35fcde7f | 593 | /* Ignore NET_XMIT_CN as packet might have been sent */ |
642e450b | 594 | if (err == NET_XMIT_DROP) { |
fe588685 MK |
595 | /* SKB completed but not sent */ |
596 | err = -EBUSY; | |
35fcde7f MK |
597 | goto out; |
598 | } | |
599 | ||
600 | sent_frame = true; | |
35fcde7f MK |
601 | } |
602 | ||
8aa5a335 CL |
603 | xs->tx->queue_empty_descs++; |
604 | ||
35fcde7f MK |
605 | out: |
606 | if (sent_frame) | |
3413f041 XZ |
607 | if (xsk_tx_writeable(xs)) |
608 | sk->sk_write_space(sk); | |
35fcde7f MK |
609 | |
610 | mutex_unlock(&xs->mutex); | |
611 | return err; | |
612 | } | |
613 | ||
df551058 MK |
614 | static int __xsk_sendmsg(struct sock *sk) |
615 | { | |
616 | struct xdp_sock *xs = xdp_sk(sk); | |
617 | ||
618 | if (unlikely(!(xs->dev->flags & IFF_UP))) | |
619 | return -ENETDOWN; | |
620 | if (unlikely(!xs->tx)) | |
621 | return -ENOBUFS; | |
622 | ||
623 | return xs->zc ? xsk_zc_xmit(xs) : xsk_generic_xmit(sk); | |
624 | } | |
625 | ||
a0731952 BT |
626 | static bool xsk_no_wakeup(struct sock *sk) |
627 | { | |
628 | #ifdef CONFIG_NET_RX_BUSY_POLL | |
629 | /* Prefer busy-polling, skip the wakeup. */ | |
630 | return READ_ONCE(sk->sk_prefer_busy_poll) && READ_ONCE(sk->sk_ll_usec) && | |
631 | READ_ONCE(sk->sk_napi_id) >= MIN_NAPI_ID; | |
632 | #else | |
633 | return false; | |
634 | #endif | |
635 | } | |
636 | ||
35fcde7f MK |
637 | static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
638 | { | |
ac98d8aa | 639 | bool need_wait = !(m->msg_flags & MSG_DONTWAIT); |
35fcde7f MK |
640 | struct sock *sk = sock->sk; |
641 | struct xdp_sock *xs = xdp_sk(sk); | |
e3920818 | 642 | struct xsk_buff_pool *pool; |
35fcde7f | 643 | |
42fddcc7 | 644 | if (unlikely(!xsk_is_bound(xs))) |
35fcde7f | 645 | return -ENXIO; |
df551058 | 646 | if (unlikely(need_wait)) |
ac98d8aa | 647 | return -EOPNOTSUPP; |
35fcde7f | 648 | |
a0731952 BT |
649 | if (sk_can_busy_loop(sk)) |
650 | sk_busy_loop(sk, 1); /* only support non-blocking sockets */ | |
651 | ||
652 | if (xsk_no_wakeup(sk)) | |
653 | return 0; | |
654 | ||
e3920818 BT |
655 | pool = xs->pool; |
656 | if (pool->cached_need_wakeup & XDP_WAKEUP_TX) | |
657 | return __xsk_sendmsg(sk); | |
658 | return 0; | |
35fcde7f MK |
659 | } |
660 | ||
45a86681 BT |
661 | static int xsk_recvmsg(struct socket *sock, struct msghdr *m, size_t len, int flags) |
662 | { | |
663 | bool need_wait = !(flags & MSG_DONTWAIT); | |
664 | struct sock *sk = sock->sk; | |
665 | struct xdp_sock *xs = xdp_sk(sk); | |
666 | ||
3546b9b8 BT |
667 | if (unlikely(!xsk_is_bound(xs))) |
668 | return -ENXIO; | |
45a86681 BT |
669 | if (unlikely(!(xs->dev->flags & IFF_UP))) |
670 | return -ENETDOWN; | |
671 | if (unlikely(!xs->rx)) | |
672 | return -ENOBUFS; | |
45a86681 BT |
673 | if (unlikely(need_wait)) |
674 | return -EOPNOTSUPP; | |
675 | ||
a0731952 BT |
676 | if (sk_can_busy_loop(sk)) |
677 | sk_busy_loop(sk, 1); /* only support non-blocking sockets */ | |
678 | ||
679 | if (xsk_no_wakeup(sk)) | |
680 | return 0; | |
681 | ||
45a86681 BT |
682 | if (xs->pool->cached_need_wakeup & XDP_WAKEUP_RX && xs->zc) |
683 | return xsk_wakeup(xs, XDP_WAKEUP_RX); | |
684 | return 0; | |
35fcde7f MK |
685 | } |
686 | ||
5d946c5a | 687 | static __poll_t xsk_poll(struct file *file, struct socket *sock, |
a11e1d43 | 688 | struct poll_table_struct *wait) |
c497176c | 689 | { |
f5da5418 | 690 | __poll_t mask = 0; |
df551058 MK |
691 | struct sock *sk = sock->sk; |
692 | struct xdp_sock *xs = xdp_sk(sk); | |
c2d3d6a4 | 693 | struct xsk_buff_pool *pool; |
42fddcc7 | 694 | |
f5da5418 XZ |
695 | sock_poll_wait(file, sock, wait); |
696 | ||
42fddcc7 BT |
697 | if (unlikely(!xsk_is_bound(xs))) |
698 | return mask; | |
699 | ||
c2d3d6a4 | 700 | pool = xs->pool; |
77cd0d7b | 701 | |
c2d3d6a4 | 702 | if (pool->cached_need_wakeup) { |
06870682 | 703 | if (xs->zc) |
c2d3d6a4 | 704 | xsk_wakeup(xs, pool->cached_need_wakeup); |
df551058 MK |
705 | else |
706 | /* Poll needs to drive Tx also in copy mode */ | |
707 | __xsk_sendmsg(sk); | |
708 | } | |
c497176c | 709 | |
59e35e55 | 710 | if (xs->rx && !xskq_prod_is_empty(xs->rx)) |
5d946c5a | 711 | mask |= EPOLLIN | EPOLLRDNORM; |
3413f041 | 712 | if (xs->tx && xsk_tx_writeable(xs)) |
5d946c5a | 713 | mask |= EPOLLOUT | EPOLLWRNORM; |
c497176c BT |
714 | |
715 | return mask; | |
716 | } | |
717 | ||
b9b6b68e BT |
718 | static int xsk_init_queue(u32 entries, struct xsk_queue **queue, |
719 | bool umem_queue) | |
423f3832 MK |
720 | { |
721 | struct xsk_queue *q; | |
722 | ||
723 | if (entries == 0 || *queue || !is_power_of_2(entries)) | |
724 | return -EINVAL; | |
725 | ||
b9b6b68e | 726 | q = xskq_create(entries, umem_queue); |
423f3832 MK |
727 | if (!q) |
728 | return -ENOMEM; | |
729 | ||
37b07693 BT |
730 | /* Make sure queue is ready before it can be seen by others */ |
731 | smp_wmb(); | |
94a99763 | 732 | WRITE_ONCE(*queue, q); |
423f3832 MK |
733 | return 0; |
734 | } | |
735 | ||
455302d1 IM |
736 | static void xsk_unbind_dev(struct xdp_sock *xs) |
737 | { | |
738 | struct net_device *dev = xs->dev; | |
739 | ||
42fddcc7 | 740 | if (xs->state != XSK_BOUND) |
455302d1 | 741 | return; |
42fddcc7 | 742 | WRITE_ONCE(xs->state, XSK_UNBOUND); |
455302d1 IM |
743 | |
744 | /* Wait for driver to stop using the xdp socket. */ | |
a5aa8e52 | 745 | xp_del_xsk(xs->pool, xs); |
455302d1 IM |
746 | xs->dev = NULL; |
747 | synchronize_net(); | |
748 | dev_put(dev); | |
749 | } | |
750 | ||
0402acd6 | 751 | static struct xsk_map *xsk_get_map_list_entry(struct xdp_sock *xs, |
782347b6 | 752 | struct xdp_sock __rcu ***map_entry) |
0402acd6 BT |
753 | { |
754 | struct xsk_map *map = NULL; | |
755 | struct xsk_map_node *node; | |
756 | ||
757 | *map_entry = NULL; | |
758 | ||
759 | spin_lock_bh(&xs->map_list_lock); | |
760 | node = list_first_entry_or_null(&xs->map_list, struct xsk_map_node, | |
761 | node); | |
762 | if (node) { | |
bb1b25ca | 763 | bpf_map_inc(&node->map->map); |
0402acd6 BT |
764 | map = node->map; |
765 | *map_entry = node->map_entry; | |
766 | } | |
767 | spin_unlock_bh(&xs->map_list_lock); | |
768 | return map; | |
769 | } | |
770 | ||
771 | static void xsk_delete_from_maps(struct xdp_sock *xs) | |
772 | { | |
773 | /* This function removes the current XDP socket from all the | |
774 | * maps it resides in. We need to take extra care here, due to | |
775 | * the two locks involved. Each map has a lock synchronizing | |
776 | * updates to the entries, and each socket has a lock that | |
777 | * synchronizes access to the list of maps (map_list). For | |
778 | * deadlock avoidance the locks need to be taken in the order | |
779 | * "map lock"->"socket map list lock". We start off by | |
780 | * accessing the socket map list, and take a reference to the | |
781 | * map to guarantee existence between the | |
782 | * xsk_get_map_list_entry() and xsk_map_try_sock_delete() | |
783 | * calls. Then we ask the map to remove the socket, which | |
784 | * tries to remove the socket from the map. Note that there | |
785 | * might be updates to the map between | |
786 | * xsk_get_map_list_entry() and xsk_map_try_sock_delete(). | |
787 | */ | |
782347b6 | 788 | struct xdp_sock __rcu **map_entry = NULL; |
0402acd6 BT |
789 | struct xsk_map *map; |
790 | ||
791 | while ((map = xsk_get_map_list_entry(xs, &map_entry))) { | |
792 | xsk_map_try_sock_delete(map, xs, map_entry); | |
bb1b25ca | 793 | bpf_map_put(&map->map); |
0402acd6 BT |
794 | } |
795 | } | |
796 | ||
c0c77d8f BT |
797 | static int xsk_release(struct socket *sock) |
798 | { | |
799 | struct sock *sk = sock->sk; | |
965a9909 | 800 | struct xdp_sock *xs = xdp_sk(sk); |
c0c77d8f BT |
801 | struct net *net; |
802 | ||
803 | if (!sk) | |
804 | return 0; | |
805 | ||
806 | net = sock_net(sk); | |
807 | ||
1d0dc069 BT |
808 | mutex_lock(&net->xdp.lock); |
809 | sk_del_node_init_rcu(sk); | |
810 | mutex_unlock(&net->xdp.lock); | |
811 | ||
c0c77d8f BT |
812 | local_bh_disable(); |
813 | sock_prot_inuse_add(net, sk->sk_prot, -1); | |
814 | local_bh_enable(); | |
815 | ||
0402acd6 | 816 | xsk_delete_from_maps(xs); |
42fddcc7 | 817 | mutex_lock(&xs->mutex); |
455302d1 | 818 | xsk_unbind_dev(xs); |
42fddcc7 | 819 | mutex_unlock(&xs->mutex); |
965a9909 | 820 | |
541d7fdd BT |
821 | xskq_destroy(xs->rx); |
822 | xskq_destroy(xs->tx); | |
7361f9c3 MK |
823 | xskq_destroy(xs->fq_tmp); |
824 | xskq_destroy(xs->cq_tmp); | |
541d7fdd | 825 | |
c0c77d8f BT |
826 | sock_orphan(sk); |
827 | sock->sk = NULL; | |
828 | ||
829 | sk_refcnt_debug_release(sk); | |
830 | sock_put(sk); | |
831 | ||
832 | return 0; | |
833 | } | |
834 | ||
965a9909 MK |
835 | static struct socket *xsk_lookup_xsk_from_fd(int fd) |
836 | { | |
837 | struct socket *sock; | |
838 | int err; | |
839 | ||
840 | sock = sockfd_lookup(fd, &err); | |
841 | if (!sock) | |
842 | return ERR_PTR(-ENOTSOCK); | |
843 | ||
844 | if (sock->sk->sk_family != PF_XDP) { | |
845 | sockfd_put(sock); | |
846 | return ERR_PTR(-ENOPROTOOPT); | |
847 | } | |
848 | ||
849 | return sock; | |
850 | } | |
851 | ||
7361f9c3 MK |
852 | static bool xsk_validate_queues(struct xdp_sock *xs) |
853 | { | |
854 | return xs->fq_tmp && xs->cq_tmp; | |
855 | } | |
856 | ||
965a9909 MK |
857 | static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) |
858 | { | |
859 | struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr; | |
860 | struct sock *sk = sock->sk; | |
965a9909 | 861 | struct xdp_sock *xs = xdp_sk(sk); |
959b71db | 862 | struct net_device *dev; |
173d3adb | 863 | u32 flags, qid; |
965a9909 MK |
864 | int err = 0; |
865 | ||
866 | if (addr_len < sizeof(struct sockaddr_xdp)) | |
867 | return -EINVAL; | |
868 | if (sxdp->sxdp_family != AF_XDP) | |
869 | return -EINVAL; | |
870 | ||
f54ba391 | 871 | flags = sxdp->sxdp_flags; |
77cd0d7b MK |
872 | if (flags & ~(XDP_SHARED_UMEM | XDP_COPY | XDP_ZEROCOPY | |
873 | XDP_USE_NEED_WAKEUP)) | |
f54ba391 BT |
874 | return -EINVAL; |
875 | ||
5464c3a0 | 876 | rtnl_lock(); |
965a9909 | 877 | mutex_lock(&xs->mutex); |
455302d1 | 878 | if (xs->state != XSK_READY) { |
959b71db BT |
879 | err = -EBUSY; |
880 | goto out_release; | |
881 | } | |
882 | ||
965a9909 MK |
883 | dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex); |
884 | if (!dev) { | |
885 | err = -ENODEV; | |
886 | goto out_release; | |
887 | } | |
888 | ||
f6145903 | 889 | if (!xs->rx && !xs->tx) { |
965a9909 MK |
890 | err = -EINVAL; |
891 | goto out_unlock; | |
892 | } | |
893 | ||
173d3adb | 894 | qid = sxdp->sxdp_queue_id; |
173d3adb BT |
895 | |
896 | if (flags & XDP_SHARED_UMEM) { | |
965a9909 MK |
897 | struct xdp_sock *umem_xs; |
898 | struct socket *sock; | |
899 | ||
77cd0d7b MK |
900 | if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY) || |
901 | (flags & XDP_USE_NEED_WAKEUP)) { | |
173d3adb BT |
902 | /* Cannot specify flags for shared sockets. */ |
903 | err = -EINVAL; | |
904 | goto out_unlock; | |
905 | } | |
906 | ||
965a9909 MK |
907 | if (xs->umem) { |
908 | /* We have already our own. */ | |
909 | err = -EINVAL; | |
910 | goto out_unlock; | |
911 | } | |
912 | ||
913 | sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd); | |
914 | if (IS_ERR(sock)) { | |
915 | err = PTR_ERR(sock); | |
916 | goto out_unlock; | |
917 | } | |
918 | ||
919 | umem_xs = xdp_sk(sock->sk); | |
42fddcc7 | 920 | if (!xsk_is_bound(umem_xs)) { |
965a9909 MK |
921 | err = -EBADF; |
922 | sockfd_put(sock); | |
923 | goto out_unlock; | |
42fddcc7 | 924 | } |
965a9909 | 925 | |
a1132430 MK |
926 | if (umem_xs->queue_id != qid || umem_xs->dev != dev) { |
927 | /* Share the umem with another socket on another qid | |
928 | * and/or device. | |
929 | */ | |
b5aea28d MK |
930 | xs->pool = xp_create_and_assign_umem(xs, |
931 | umem_xs->umem); | |
932 | if (!xs->pool) { | |
1fd17c8c | 933 | err = -ENOMEM; |
b5aea28d MK |
934 | sockfd_put(sock); |
935 | goto out_unlock; | |
936 | } | |
937 | ||
938 | err = xp_assign_dev_shared(xs->pool, umem_xs->umem, | |
939 | dev, qid); | |
940 | if (err) { | |
941 | xp_destroy(xs->pool); | |
83cf5c68 | 942 | xs->pool = NULL; |
b5aea28d MK |
943 | sockfd_put(sock); |
944 | goto out_unlock; | |
945 | } | |
946 | } else { | |
947 | /* Share the buffer pool with the other socket. */ | |
948 | if (xs->fq_tmp || xs->cq_tmp) { | |
949 | /* Do not allow setting your own fq or cq. */ | |
950 | err = -EINVAL; | |
951 | sockfd_put(sock); | |
952 | goto out_unlock; | |
953 | } | |
954 | ||
955 | xp_get_pool(umem_xs->pool); | |
956 | xs->pool = umem_xs->pool; | |
957 | } | |
958 | ||
965a9909 | 959 | xdp_get_umem(umem_xs->umem); |
9764f4b3 | 960 | WRITE_ONCE(xs->umem, umem_xs->umem); |
965a9909 | 961 | sockfd_put(sock); |
7361f9c3 | 962 | } else if (!xs->umem || !xsk_validate_queues(xs)) { |
965a9909 MK |
963 | err = -EINVAL; |
964 | goto out_unlock; | |
c497176c BT |
965 | } else { |
966 | /* This xsk has its own umem. */ | |
1c1efc2a MK |
967 | xs->pool = xp_create_and_assign_umem(xs, xs->umem); |
968 | if (!xs->pool) { | |
969 | err = -ENOMEM; | |
173d3adb | 970 | goto out_unlock; |
1c1efc2a MK |
971 | } |
972 | ||
973 | err = xp_assign_dev(xs->pool, dev, qid, flags); | |
974 | if (err) { | |
975 | xp_destroy(xs->pool); | |
976 | xs->pool = NULL; | |
1c1efc2a MK |
977 | goto out_unlock; |
978 | } | |
965a9909 MK |
979 | } |
980 | ||
8bee6833 MK |
981 | /* FQ and CQ are now owned by the buffer pool and cleaned up with it. */ |
982 | xs->fq_tmp = NULL; | |
983 | xs->cq_tmp = NULL; | |
984 | ||
965a9909 | 985 | xs->dev = dev; |
ac98d8aa MK |
986 | xs->zc = xs->umem->zc; |
987 | xs->queue_id = qid; | |
a5aa8e52 | 988 | xp_add_xsk(xs->pool, xs); |
965a9909 MK |
989 | |
990 | out_unlock: | |
42fddcc7 | 991 | if (err) { |
965a9909 | 992 | dev_put(dev); |
42fddcc7 BT |
993 | } else { |
994 | /* Matches smp_rmb() in bind() for shared umem | |
995 | * sockets, and xsk_is_bound(). | |
996 | */ | |
997 | smp_wmb(); | |
998 | WRITE_ONCE(xs->state, XSK_BOUND); | |
999 | } | |
965a9909 MK |
1000 | out_release: |
1001 | mutex_unlock(&xs->mutex); | |
5464c3a0 | 1002 | rtnl_unlock(); |
965a9909 MK |
1003 | return err; |
1004 | } | |
1005 | ||
c05cd364 KL |
1006 | struct xdp_umem_reg_v1 { |
1007 | __u64 addr; /* Start of packet data area */ | |
1008 | __u64 len; /* Length of packet data area */ | |
1009 | __u32 chunk_size; | |
1010 | __u32 headroom; | |
1011 | }; | |
1012 | ||
c0c77d8f | 1013 | static int xsk_setsockopt(struct socket *sock, int level, int optname, |
a7b75c5a | 1014 | sockptr_t optval, unsigned int optlen) |
c0c77d8f BT |
1015 | { |
1016 | struct sock *sk = sock->sk; | |
1017 | struct xdp_sock *xs = xdp_sk(sk); | |
1018 | int err; | |
1019 | ||
1020 | if (level != SOL_XDP) | |
1021 | return -ENOPROTOOPT; | |
1022 | ||
1023 | switch (optname) { | |
b9b6b68e | 1024 | case XDP_RX_RING: |
f6145903 | 1025 | case XDP_TX_RING: |
b9b6b68e BT |
1026 | { |
1027 | struct xsk_queue **q; | |
1028 | int entries; | |
1029 | ||
1030 | if (optlen < sizeof(entries)) | |
1031 | return -EINVAL; | |
a7b75c5a | 1032 | if (copy_from_sockptr(&entries, optval, sizeof(entries))) |
b9b6b68e BT |
1033 | return -EFAULT; |
1034 | ||
1035 | mutex_lock(&xs->mutex); | |
455302d1 IM |
1036 | if (xs->state != XSK_READY) { |
1037 | mutex_unlock(&xs->mutex); | |
1038 | return -EBUSY; | |
1039 | } | |
f6145903 | 1040 | q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx; |
b9b6b68e | 1041 | err = xsk_init_queue(entries, q, false); |
77cd0d7b MK |
1042 | if (!err && optname == XDP_TX_RING) |
1043 | /* Tx needs to be explicitly woken up the first time */ | |
1044 | xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP; | |
b9b6b68e BT |
1045 | mutex_unlock(&xs->mutex); |
1046 | return err; | |
1047 | } | |
c0c77d8f BT |
1048 | case XDP_UMEM_REG: |
1049 | { | |
c05cd364 KL |
1050 | size_t mr_size = sizeof(struct xdp_umem_reg); |
1051 | struct xdp_umem_reg mr = {}; | |
c0c77d8f BT |
1052 | struct xdp_umem *umem; |
1053 | ||
c05cd364 KL |
1054 | if (optlen < sizeof(struct xdp_umem_reg_v1)) |
1055 | return -EINVAL; | |
1056 | else if (optlen < sizeof(mr)) | |
1057 | mr_size = sizeof(struct xdp_umem_reg_v1); | |
1058 | ||
a7b75c5a | 1059 | if (copy_from_sockptr(&mr, optval, mr_size)) |
c0c77d8f BT |
1060 | return -EFAULT; |
1061 | ||
1062 | mutex_lock(&xs->mutex); | |
455302d1 | 1063 | if (xs->state != XSK_READY || xs->umem) { |
a49049ea BT |
1064 | mutex_unlock(&xs->mutex); |
1065 | return -EBUSY; | |
1066 | } | |
c0c77d8f | 1067 | |
a49049ea BT |
1068 | umem = xdp_umem_create(&mr); |
1069 | if (IS_ERR(umem)) { | |
c0c77d8f | 1070 | mutex_unlock(&xs->mutex); |
a49049ea | 1071 | return PTR_ERR(umem); |
c0c77d8f BT |
1072 | } |
1073 | ||
1074 | /* Make sure umem is ready before it can be seen by others */ | |
1075 | smp_wmb(); | |
9764f4b3 | 1076 | WRITE_ONCE(xs->umem, umem); |
c0c77d8f BT |
1077 | mutex_unlock(&xs->mutex); |
1078 | return 0; | |
1079 | } | |
423f3832 | 1080 | case XDP_UMEM_FILL_RING: |
fe230832 | 1081 | case XDP_UMEM_COMPLETION_RING: |
423f3832 MK |
1082 | { |
1083 | struct xsk_queue **q; | |
1084 | int entries; | |
1085 | ||
a7b75c5a | 1086 | if (copy_from_sockptr(&entries, optval, sizeof(entries))) |
423f3832 MK |
1087 | return -EFAULT; |
1088 | ||
1089 | mutex_lock(&xs->mutex); | |
455302d1 IM |
1090 | if (xs->state != XSK_READY) { |
1091 | mutex_unlock(&xs->mutex); | |
1092 | return -EBUSY; | |
1093 | } | |
a49049ea | 1094 | |
7361f9c3 MK |
1095 | q = (optname == XDP_UMEM_FILL_RING) ? &xs->fq_tmp : |
1096 | &xs->cq_tmp; | |
b9b6b68e | 1097 | err = xsk_init_queue(entries, q, true); |
423f3832 MK |
1098 | mutex_unlock(&xs->mutex); |
1099 | return err; | |
1100 | } | |
c0c77d8f BT |
1101 | default: |
1102 | break; | |
1103 | } | |
1104 | ||
1105 | return -ENOPROTOOPT; | |
1106 | } | |
1107 | ||
77cd0d7b MK |
1108 | static void xsk_enter_rxtx_offsets(struct xdp_ring_offset_v1 *ring) |
1109 | { | |
1110 | ring->producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); | |
1111 | ring->consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); | |
1112 | ring->desc = offsetof(struct xdp_rxtx_ring, desc); | |
1113 | } | |
1114 | ||
1115 | static void xsk_enter_umem_offsets(struct xdp_ring_offset_v1 *ring) | |
1116 | { | |
1117 | ring->producer = offsetof(struct xdp_umem_ring, ptrs.producer); | |
1118 | ring->consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); | |
1119 | ring->desc = offsetof(struct xdp_umem_ring, desc); | |
1120 | } | |
1121 | ||
8aa5a335 CL |
1122 | struct xdp_statistics_v1 { |
1123 | __u64 rx_dropped; | |
1124 | __u64 rx_invalid_descs; | |
1125 | __u64 tx_invalid_descs; | |
1126 | }; | |
1127 | ||
af75d9e0 MK |
1128 | static int xsk_getsockopt(struct socket *sock, int level, int optname, |
1129 | char __user *optval, int __user *optlen) | |
1130 | { | |
1131 | struct sock *sk = sock->sk; | |
1132 | struct xdp_sock *xs = xdp_sk(sk); | |
1133 | int len; | |
1134 | ||
1135 | if (level != SOL_XDP) | |
1136 | return -ENOPROTOOPT; | |
1137 | ||
1138 | if (get_user(len, optlen)) | |
1139 | return -EFAULT; | |
1140 | if (len < 0) | |
1141 | return -EINVAL; | |
1142 | ||
1143 | switch (optname) { | |
1144 | case XDP_STATISTICS: | |
1145 | { | |
3c4f850e | 1146 | struct xdp_statistics stats = {}; |
8aa5a335 CL |
1147 | bool extra_stats = true; |
1148 | size_t stats_size; | |
af75d9e0 | 1149 | |
8aa5a335 | 1150 | if (len < sizeof(struct xdp_statistics_v1)) { |
af75d9e0 | 1151 | return -EINVAL; |
8aa5a335 CL |
1152 | } else if (len < sizeof(stats)) { |
1153 | extra_stats = false; | |
1154 | stats_size = sizeof(struct xdp_statistics_v1); | |
1155 | } else { | |
1156 | stats_size = sizeof(stats); | |
1157 | } | |
af75d9e0 MK |
1158 | |
1159 | mutex_lock(&xs->mutex); | |
1160 | stats.rx_dropped = xs->rx_dropped; | |
8aa5a335 CL |
1161 | if (extra_stats) { |
1162 | stats.rx_ring_full = xs->rx_queue_full; | |
1163 | stats.rx_fill_ring_empty_descs = | |
7361f9c3 | 1164 | xs->pool ? xskq_nb_queue_empty_descs(xs->pool->fq) : 0; |
8aa5a335 CL |
1165 | stats.tx_ring_empty_descs = xskq_nb_queue_empty_descs(xs->tx); |
1166 | } else { | |
1167 | stats.rx_dropped += xs->rx_queue_full; | |
1168 | } | |
af75d9e0 MK |
1169 | stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx); |
1170 | stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx); | |
1171 | mutex_unlock(&xs->mutex); | |
1172 | ||
8aa5a335 | 1173 | if (copy_to_user(optval, &stats, stats_size)) |
af75d9e0 | 1174 | return -EFAULT; |
8aa5a335 | 1175 | if (put_user(stats_size, optlen)) |
af75d9e0 MK |
1176 | return -EFAULT; |
1177 | ||
1178 | return 0; | |
1179 | } | |
b3a9e0be BT |
1180 | case XDP_MMAP_OFFSETS: |
1181 | { | |
1182 | struct xdp_mmap_offsets off; | |
77cd0d7b MK |
1183 | struct xdp_mmap_offsets_v1 off_v1; |
1184 | bool flags_supported = true; | |
1185 | void *to_copy; | |
b3a9e0be | 1186 | |
77cd0d7b | 1187 | if (len < sizeof(off_v1)) |
b3a9e0be | 1188 | return -EINVAL; |
77cd0d7b MK |
1189 | else if (len < sizeof(off)) |
1190 | flags_supported = false; | |
1191 | ||
1192 | if (flags_supported) { | |
1193 | /* xdp_ring_offset is identical to xdp_ring_offset_v1 | |
1194 | * except for the flags field added to the end. | |
1195 | */ | |
1196 | xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) | |
1197 | &off.rx); | |
1198 | xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) | |
1199 | &off.tx); | |
1200 | xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) | |
1201 | &off.fr); | |
1202 | xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) | |
1203 | &off.cr); | |
1204 | off.rx.flags = offsetof(struct xdp_rxtx_ring, | |
1205 | ptrs.flags); | |
1206 | off.tx.flags = offsetof(struct xdp_rxtx_ring, | |
1207 | ptrs.flags); | |
1208 | off.fr.flags = offsetof(struct xdp_umem_ring, | |
1209 | ptrs.flags); | |
1210 | off.cr.flags = offsetof(struct xdp_umem_ring, | |
1211 | ptrs.flags); | |
1212 | ||
1213 | len = sizeof(off); | |
1214 | to_copy = &off; | |
1215 | } else { | |
1216 | xsk_enter_rxtx_offsets(&off_v1.rx); | |
1217 | xsk_enter_rxtx_offsets(&off_v1.tx); | |
1218 | xsk_enter_umem_offsets(&off_v1.fr); | |
1219 | xsk_enter_umem_offsets(&off_v1.cr); | |
1220 | ||
1221 | len = sizeof(off_v1); | |
1222 | to_copy = &off_v1; | |
1223 | } | |
b3a9e0be | 1224 | |
77cd0d7b | 1225 | if (copy_to_user(optval, to_copy, len)) |
b3a9e0be BT |
1226 | return -EFAULT; |
1227 | if (put_user(len, optlen)) | |
1228 | return -EFAULT; | |
1229 | ||
1230 | return 0; | |
1231 | } | |
2640d3c8 MM |
1232 | case XDP_OPTIONS: |
1233 | { | |
1234 | struct xdp_options opts = {}; | |
1235 | ||
1236 | if (len < sizeof(opts)) | |
1237 | return -EINVAL; | |
1238 | ||
1239 | mutex_lock(&xs->mutex); | |
1240 | if (xs->zc) | |
1241 | opts.flags |= XDP_OPTIONS_ZEROCOPY; | |
1242 | mutex_unlock(&xs->mutex); | |
1243 | ||
1244 | len = sizeof(opts); | |
1245 | if (copy_to_user(optval, &opts, len)) | |
1246 | return -EFAULT; | |
1247 | if (put_user(len, optlen)) | |
1248 | return -EFAULT; | |
1249 | ||
1250 | return 0; | |
1251 | } | |
af75d9e0 MK |
1252 | default: |
1253 | break; | |
1254 | } | |
1255 | ||
1256 | return -EOPNOTSUPP; | |
1257 | } | |
1258 | ||
423f3832 MK |
1259 | static int xsk_mmap(struct file *file, struct socket *sock, |
1260 | struct vm_area_struct *vma) | |
1261 | { | |
a5a16e43 | 1262 | loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT; |
423f3832 MK |
1263 | unsigned long size = vma->vm_end - vma->vm_start; |
1264 | struct xdp_sock *xs = xdp_sk(sock->sk); | |
1265 | struct xsk_queue *q = NULL; | |
1266 | unsigned long pfn; | |
1267 | struct page *qpg; | |
1268 | ||
42fddcc7 | 1269 | if (READ_ONCE(xs->state) != XSK_READY) |
455302d1 IM |
1270 | return -EBUSY; |
1271 | ||
b9b6b68e | 1272 | if (offset == XDP_PGOFF_RX_RING) { |
37b07693 | 1273 | q = READ_ONCE(xs->rx); |
f6145903 | 1274 | } else if (offset == XDP_PGOFF_TX_RING) { |
37b07693 | 1275 | q = READ_ONCE(xs->tx); |
b9b6b68e | 1276 | } else { |
e6762c8b MK |
1277 | /* Matches the smp_wmb() in XDP_UMEM_REG */ |
1278 | smp_rmb(); | |
b9b6b68e | 1279 | if (offset == XDP_UMEM_PGOFF_FILL_RING) |
7361f9c3 | 1280 | q = READ_ONCE(xs->fq_tmp); |
fe230832 | 1281 | else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING) |
7361f9c3 | 1282 | q = READ_ONCE(xs->cq_tmp); |
b9b6b68e | 1283 | } |
423f3832 MK |
1284 | |
1285 | if (!q) | |
1286 | return -EINVAL; | |
1287 | ||
e6762c8b MK |
1288 | /* Matches the smp_wmb() in xsk_init_queue */ |
1289 | smp_rmb(); | |
423f3832 | 1290 | qpg = virt_to_head_page(q->ring); |
a50b854e | 1291 | if (size > page_size(qpg)) |
423f3832 MK |
1292 | return -EINVAL; |
1293 | ||
1294 | pfn = virt_to_phys(q->ring) >> PAGE_SHIFT; | |
1295 | return remap_pfn_range(vma, vma->vm_start, pfn, | |
1296 | size, vma->vm_page_prot); | |
1297 | } | |
1298 | ||
455302d1 IM |
1299 | static int xsk_notifier(struct notifier_block *this, |
1300 | unsigned long msg, void *ptr) | |
1301 | { | |
1302 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1303 | struct net *net = dev_net(dev); | |
1304 | struct sock *sk; | |
1305 | ||
1306 | switch (msg) { | |
1307 | case NETDEV_UNREGISTER: | |
1308 | mutex_lock(&net->xdp.lock); | |
1309 | sk_for_each(sk, &net->xdp.list) { | |
1310 | struct xdp_sock *xs = xdp_sk(sk); | |
1311 | ||
1312 | mutex_lock(&xs->mutex); | |
1313 | if (xs->dev == dev) { | |
1314 | sk->sk_err = ENETDOWN; | |
1315 | if (!sock_flag(sk, SOCK_DEAD)) | |
e3ae2365 | 1316 | sk_error_report(sk); |
455302d1 IM |
1317 | |
1318 | xsk_unbind_dev(xs); | |
1319 | ||
1c1efc2a MK |
1320 | /* Clear device references. */ |
1321 | xp_clear_dev(xs->pool); | |
455302d1 IM |
1322 | } |
1323 | mutex_unlock(&xs->mutex); | |
1324 | } | |
1325 | mutex_unlock(&net->xdp.lock); | |
1326 | break; | |
1327 | } | |
1328 | return NOTIFY_DONE; | |
1329 | } | |
1330 | ||
c0c77d8f BT |
1331 | static struct proto xsk_proto = { |
1332 | .name = "XDP", | |
1333 | .owner = THIS_MODULE, | |
1334 | .obj_size = sizeof(struct xdp_sock), | |
1335 | }; | |
1336 | ||
1337 | static const struct proto_ops xsk_proto_ops = { | |
c2f4374b BT |
1338 | .family = PF_XDP, |
1339 | .owner = THIS_MODULE, | |
1340 | .release = xsk_release, | |
1341 | .bind = xsk_bind, | |
1342 | .connect = sock_no_connect, | |
1343 | .socketpair = sock_no_socketpair, | |
1344 | .accept = sock_no_accept, | |
1345 | .getname = sock_no_getname, | |
a11e1d43 | 1346 | .poll = xsk_poll, |
c2f4374b BT |
1347 | .ioctl = sock_no_ioctl, |
1348 | .listen = sock_no_listen, | |
1349 | .shutdown = sock_no_shutdown, | |
1350 | .setsockopt = xsk_setsockopt, | |
1351 | .getsockopt = xsk_getsockopt, | |
1352 | .sendmsg = xsk_sendmsg, | |
45a86681 | 1353 | .recvmsg = xsk_recvmsg, |
c2f4374b BT |
1354 | .mmap = xsk_mmap, |
1355 | .sendpage = sock_no_sendpage, | |
c0c77d8f BT |
1356 | }; |
1357 | ||
11fe9262 BT |
1358 | static void xsk_destruct(struct sock *sk) |
1359 | { | |
1360 | struct xdp_sock *xs = xdp_sk(sk); | |
1361 | ||
1362 | if (!sock_flag(sk, SOCK_DEAD)) | |
1363 | return; | |
1364 | ||
e5e1a4bc | 1365 | if (!xp_put_pool(xs->pool)) |
537cf4e3 | 1366 | xdp_put_umem(xs->umem, !xs->pool); |
11fe9262 BT |
1367 | |
1368 | sk_refcnt_debug_dec(sk); | |
1369 | } | |
1370 | ||
c0c77d8f BT |
1371 | static int xsk_create(struct net *net, struct socket *sock, int protocol, |
1372 | int kern) | |
1373 | { | |
c0c77d8f | 1374 | struct xdp_sock *xs; |
1c1efc2a | 1375 | struct sock *sk; |
c0c77d8f BT |
1376 | |
1377 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) | |
1378 | return -EPERM; | |
1379 | if (sock->type != SOCK_RAW) | |
1380 | return -ESOCKTNOSUPPORT; | |
1381 | ||
1382 | if (protocol) | |
1383 | return -EPROTONOSUPPORT; | |
1384 | ||
1385 | sock->state = SS_UNCONNECTED; | |
1386 | ||
1387 | sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern); | |
1388 | if (!sk) | |
1389 | return -ENOBUFS; | |
1390 | ||
1391 | sock->ops = &xsk_proto_ops; | |
1392 | ||
1393 | sock_init_data(sock, sk); | |
1394 | ||
1395 | sk->sk_family = PF_XDP; | |
1396 | ||
11fe9262 BT |
1397 | sk->sk_destruct = xsk_destruct; |
1398 | sk_refcnt_debug_inc(sk); | |
1399 | ||
cee27167 BT |
1400 | sock_set_flag(sk, SOCK_RCU_FREE); |
1401 | ||
c0c77d8f | 1402 | xs = xdp_sk(sk); |
455302d1 | 1403 | xs->state = XSK_READY; |
c0c77d8f | 1404 | mutex_init(&xs->mutex); |
bf0bdd13 | 1405 | spin_lock_init(&xs->rx_lock); |
c0c77d8f | 1406 | |
0402acd6 BT |
1407 | INIT_LIST_HEAD(&xs->map_list); |
1408 | spin_lock_init(&xs->map_list_lock); | |
1409 | ||
1d0dc069 BT |
1410 | mutex_lock(&net->xdp.lock); |
1411 | sk_add_node_rcu(sk, &net->xdp.list); | |
1412 | mutex_unlock(&net->xdp.lock); | |
1413 | ||
c0c77d8f BT |
1414 | local_bh_disable(); |
1415 | sock_prot_inuse_add(net, &xsk_proto, 1); | |
1416 | local_bh_enable(); | |
1417 | ||
1418 | return 0; | |
1419 | } | |
1420 | ||
1421 | static const struct net_proto_family xsk_family_ops = { | |
1422 | .family = PF_XDP, | |
1423 | .create = xsk_create, | |
1424 | .owner = THIS_MODULE, | |
1425 | }; | |
1426 | ||
455302d1 IM |
1427 | static struct notifier_block xsk_netdev_notifier = { |
1428 | .notifier_call = xsk_notifier, | |
1429 | }; | |
1430 | ||
1d0dc069 BT |
1431 | static int __net_init xsk_net_init(struct net *net) |
1432 | { | |
1433 | mutex_init(&net->xdp.lock); | |
1434 | INIT_HLIST_HEAD(&net->xdp.list); | |
1435 | return 0; | |
1436 | } | |
1437 | ||
1438 | static void __net_exit xsk_net_exit(struct net *net) | |
1439 | { | |
1440 | WARN_ON_ONCE(!hlist_empty(&net->xdp.list)); | |
1441 | } | |
1442 | ||
1443 | static struct pernet_operations xsk_net_ops = { | |
1444 | .init = xsk_net_init, | |
1445 | .exit = xsk_net_exit, | |
1446 | }; | |
1447 | ||
c0c77d8f BT |
1448 | static int __init xsk_init(void) |
1449 | { | |
e312b9e7 | 1450 | int err, cpu; |
c0c77d8f BT |
1451 | |
1452 | err = proto_register(&xsk_proto, 0 /* no slab */); | |
1453 | if (err) | |
1454 | goto out; | |
1455 | ||
1456 | err = sock_register(&xsk_family_ops); | |
1457 | if (err) | |
1458 | goto out_proto; | |
1459 | ||
1d0dc069 BT |
1460 | err = register_pernet_subsys(&xsk_net_ops); |
1461 | if (err) | |
1462 | goto out_sk; | |
455302d1 IM |
1463 | |
1464 | err = register_netdevice_notifier(&xsk_netdev_notifier); | |
1465 | if (err) | |
1466 | goto out_pernet; | |
1467 | ||
e312b9e7 BT |
1468 | for_each_possible_cpu(cpu) |
1469 | INIT_LIST_HEAD(&per_cpu(xskmap_flush_list, cpu)); | |
c0c77d8f BT |
1470 | return 0; |
1471 | ||
455302d1 IM |
1472 | out_pernet: |
1473 | unregister_pernet_subsys(&xsk_net_ops); | |
1d0dc069 BT |
1474 | out_sk: |
1475 | sock_unregister(PF_XDP); | |
c0c77d8f BT |
1476 | out_proto: |
1477 | proto_unregister(&xsk_proto); | |
1478 | out: | |
1479 | return err; | |
1480 | } | |
1481 | ||
1482 | fs_initcall(xsk_init); |